The present study aims to investigated Iranian L2 speaker`s knowledge of the overt pronounconstraint (OPC) in English. It also aims to examine L2 learners understanding of UniversalGrammar (Chomsky 1981, 1986, 2000, 2001) and if it is common to all languages. Specifically,this study takes a new look at the L2 acquisition of knowledge of the overt pronoun constraint(Montalbetti 1984) by Persian ...